U.S. patent number 9,488,770 [Application Number 14/396,565] was granted by the patent office on 2016-11-08 for light source unit and display apparatus.
This patent grant is currently assigned to Sakai Display Products Corporation. The grantee listed for this patent is Sakai Display Products Corporation. Invention is credited to Mayumi Hori, Yuki Horiguchi, Takayuki Nakazawa, Kazuhiko Negoro, Takahiro Yoshikawa.
United States Patent |
9,488,770 |
Horiguchi , et al. |
November 8, 2016 |
Light source unit and display apparatus
Abstract
A light source unit, comprising: a light guide plate; a light
source facing to a peripheral surface of the light guide plate; and
a reflection part reflecting light emitted from one surface of the
light guide plate, wherein the reflection part comprises: an
elongated portion, which is positioned at an outside of an edge of
the light guide plate, being elongated in a direction crossing the
one surface; and a protrusion portion, which is located at a
position of the elongated portion that is away from the one
surface, protruding from the position to the one surface, wherein
the one surface side of the light source is covered with the
protrusion portion.
Inventors: |
Horiguchi; Yuki (Sakai,
JP), Nakazawa; Takayuki (Sakai, JP),
Negoro; Kazuhiko (Sakai, JP), Yoshikawa; Takahiro
(Sakai, JP), Hori; Mayumi (Sakai, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
Sakai Display Products Corporation |
Sakai-shi, Osaka |
N/A |
JP |
|
|
Assignee: |
Sakai Display Products
Corporation (Sakai-shi, Osaka, JP)
|
Family
ID: |
50627310 |
Appl.
No.: |
14/396,565 |
Filed: |
October 28, 2013 |
PCT
Filed: |
October 28, 2013 |
PCT No.: |
PCT/JP2013/079142 |
371(c)(1),(2),(4) Date: |
October 23, 2014 |
PCT
Pub. No.: |
WO2014/069405 |
PCT
Pub. Date: |
May 08, 2014 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20150078032 A1 |
Mar 19, 2015 |
|
Foreign Application Priority Data
|
|
|
|
|
Oct 30, 2012 [JP] |
|
|
2012-239517 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
6/0055 (20130101); G02F 1/133308 (20130101); G02B
6/005 (20130101); G02B 6/0088 (20130101); G02B
6/0031 (20130101); G02B 6/0091 (20130101); G02F
1/133322 (20210101); G02B 6/0085 (20130101); G02F
2201/465 (20130101); G02F 1/133317 (20210101); G02F
1/133615 (20130101); G02B 6/0051 (20130101) |
Current International
Class: |
F21V
8/00 (20060101); F21V 17/00 (20060101); G02F
1/1333 (20060101); G02F 1/1335 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Cariaso; Alan
Attorney, Agent or Firm: Field; Bret E. Bozicevic, Field
& Francis LLP
Claims
The invention claimed is:
1. A light source unit, comprising: a light guide plate; a light
source facing to a peripheral surface of the light guide plate; a
reflection part reflecting light emitted from a front surface of
the light guide plate; and a diffusion plate to diffuse light which
is separated from and disposed opposite to the front surface of the
light guide plate wherein the reflection part comprises: a
diffusion plate support portion supporting a rear edge part of the
diffusion plate; an elongated portion, which is positioned at an
outside of an edge of the light guide plate, protruding from the
diffusion plate support portion to the rear side; and a protrusion
portion protruding from the diffusion plate support portion toward
an inside of the diffusion plate between the light guide plate and
the diffusion plate and reflecting light emitted from the front
surface of the light guide plate to irradiate to the diffusion
plate, wherein a front surface side of the light source is covered
with the protrusion portion.
2. The light source unit according to claim 1, wherein the
protrusion portion is inclined with respect to the light guide
plate and the diffusion plate.
3. The light source unit according to claim 2, wherein the
protrusion portion has an inclination angle of 30 degrees or more
but less than 90 degrees.
4. The light source unit according to claim 1, wherein a curved
surface is formed on a part of the protrusion portion where the
protrusion portion is opposite to the diffusion plate.
5. The light source unit according to claim 1, wherein a part of
the protrusion portion opposite to the diffusion plate is formed in
a stepped shape.
6. The light source unit according to claim 1, wherein a diffusion
sheet to diffuse light is located on the front surface of the light
guide plate.
7. The light source unit according claim 1, further comprising: a
support part which is disposed between the diffusion plate and the
light guide plate to support the diffusion plate, and which is
translucent.
8. The light source unit according to claim 1, further comprising:
a diffusion plate to diffuse light which is separated from and
disposed opposite to the one surface of the light guide plate; an
optical sheet overlapped on the diffusion plate; and a locking
piece which is positioned outside of an edge portion of the
diffusion plate, extends from an edge of the optical sheet in a
direction crossing the diffusion plate, and has a hole, wherein the
reflection part has a protrusion part which is inserted into the
hole.
9. The light source unit according to claim 1, further comprising:
an optical sheet overlapped on the diffusion plate; and a locking
piece which is positioned outside of the diffusion plate away from
an edge portion of the diffusion plate, extends from the edge of
the optical sheet in the direction crossing the diffusion plate,
and has a hole, wherein the diffusion plate has a protrusion part
which is inserted into the hole.
10. A display apparatus, comprising: the light source unit
according to claim 1; and a display panel displaying an image by
transmitting the light emitted from the light source unit, and is
supported on the reflection part, wherein the reflection part
supports the display panel at an outside of a display region of the
display panel.
11. A display apparatus, comprising: the light source unit
according to claim 1; and a display panel displaying an image by
transmitting the light emitted from the light source unit, and is
supported on the reflection part, wherein the light source is
positioned within a display region of the display panel, and the
protrusion portion is positioned between the light source and the
display panel.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is the national phase under 35 U.S.C. .sctn.371 of
PCT International Application No. PCT/JP2013/79142 which has
International filing date of Oct. 28, 2013, and designated the
United States of America.
FIELD
The technology herein relates to a light source unit which
irradiates light to an object and a display apparatus including the
light source unit.
BACKGROUND AND SUMMARY
Generally, thin type display apparatuses which occupy a small area
in comparison to a size of a display screen have been widely
distributed. Many of the thin type display apparatuses display an
image on a display panel by light from a backlight unit (a light
source unit).
There are two types of light source unit, a direct type in which a
light source unit such as a light emitting diode (LED) or a
cold-cathode fluorescent tube is disposed to face the display
panel, and an edge light type which includes a light guide plate
facing the display panel and a light source facing a peripheral
surface of the light guide plate. When using the direct type light
source unit, there is no need to acquire a space for disposing the
light source around a display unit, and it is possible to narrow
frames of the display apparatus (for example, Japanese Patent
Application Laid-Open No. 2012-48168).
Further thinning of the display apparatus is also required in
addition to the narrowing of frame in recent years. Using the edge
light type light source unit may be considered to meet the
requirements of thinning, because it is easy for the edge light
type light source unit to have a thinner light source unit compared
to the direct type light source unit.
However, when manufacturing the edge light type light source unit,
while maintaining the narrowing of frame, the light source disposed
around the light guide plate, the chassis, and the like may be
visible from an outside. Therefore, when manufacturing the edge
light type light source, there is no choice but to widen the
frame.
In consideration of the above-described circumstances, an example
embodiment aims at a light source unit and a display apparatus,
which are capable of satisfying both of the narrowing of frame and
the thinning.
According to an example embodiment, there is provided a light
source unit including a light guide plate, a light source facing to
a peripheral surface of the light guide plate, and a reflection
part reflecting light emitted from one surface of the light guide
plate, characterized in that: the reflection part comprises: an
elongated portion, which is positioned at an outside of an edge of
the light guide plate, being elongated in a direction crossing the
one surface; a protrusion portion, which is located at a position
of the elongated portion that is away from the one surface,
protruding from the position to the one surface, wherein the one
surface side of the light source is covered with the protrusion
portion.
In the light source unit according to an example embodiment, the
protrusion portion may be inclined with respect to the one
surface.
In the light source unit according to an example embodiment, the
protrusion portion may have an inclination angle of 30 degrees or
more but less than 90 degrees.
In the light source unit according to an example embodiment, a
curved surface protruding in the direction crossing the one surface
may be formed on the protrusion portion opposite to the one
surface.
In the light source unit according to an example embodiment, the
side of the protrusion portion opposite to the one surface may be
formed in a stepped shape.
In the light source unit according to an example embodiment, the
one surface may include a diffusion sheet disposed thereon to
diffuse light.
The light source unit according to an example embodiment, may
include: a diffusion plate which is separated from and disposed
opposite to the one surface of the light guide plate to diffuse
light; and a support part which is disposed between the diffusion
plate and the light guide plate to support the diffusion plate, and
which is translucent.
The light source unit according to an example embodiment, may
include: a diffusion plate which is separated from and disposed
opposite to the one surface of the light guide plate to diffuse
light; an optical sheet overlapped on the diffusion plate; and a
locking piece which is positioned outside of the diffusion plate
from an edge portion of the one surface, extends from an edge of
the optical sheet in a direction crossing the diffusion plate, and
has a hole formed therein, wherein the reflection part has a
protrusion part which is inserted into the hole.
The light source unit according to an example embodiment, may
include: a diffusion plate which is separated from and disposed
opposite to the one surface of the light guide plate to diffuse
light; an optical sheet overlapped on the diffusion plate; and a
locking piece which is positioned outside of the diffusion plate
from the edge portion of the one surface, extends from the edge of
the optical sheet in the direction crossing the diffusion plate,
and has a hole, wherein the diffusion plate has a protrusion part
which is inserted into the hole.
According to an example embodiment, there is provided a display
apparatus including: the light source unit according to any one of
the above; and a display panel which is configured to display an
image by transmitting the light emitted from the light source unit,
and is supported on the reflection part, wherein the reflection
part supports the display panel at an outside of the display region
of the display panel.
According to an example embodiment, there is provided a display
apparatus including: the light source unit according to any one of
the above; and a display panel which is configured to display an
image by transmitting the light emitted from the light source unit,
and is supported on the reflection part, wherein the light source
is positioned within the display region of the display panel, and
the protrusion portion is positioned between the light source and
the display panel.
According to an example embodiment, there is provided a television
receiving apparatus includes: the display apparatus according to
any one of the above; and a receiving unit which receives
television broadcasts, wherein the display apparatus is configured
to display an image based on the television broadcasts received by
the receiving unit.
According to an example embodiment, in the edge light type light
source unit, the protrusion portion protruding to the one surface
of the light guide plate is provided, and components such as a
light source are positioned at the back side of the protrusion
portion. In addition, since the light emitted from the one surface
of the light guide plate is diffused by the protrusion portion,
decreasing of luminance in the edge portion may be prevented, and
both of the narrowing of frame and the thinning may be
achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view schematically illustrating a
non-limiting example of a television receiving apparatus according
to Embodiment 1.
FIG. 2 is a partial cross-sectional view schematically illustrating
a non-limiting example of an internal configuration of the
television receiving apparatus.
FIG. 3 is a graph illustrating a non-limiting example of a
relationship between a distance from a tip of the LED in a
direction toward an inside of a light guide plate and a relative
value of luminance when luminance at a position of 50 mm inward of
the light guide plate from the tip of the LED is set to 1.
FIG. 4 is a schematic diagram illustrating a non-limiting example
of a relationship between an inclination angle of a reflection
plate and dark and light bands which are viewed on a display
surface of a liquid crystal display panel.
FIG. 5 is a partial cross-sectional view schematically illustrating
a non-limiting example of the internal configuration of a display
apparatus according to a first modified embodiment.
FIG. 6 is a partial cross-sectional view schematically illustrating
a non-limiting example of the internal configuration of a display
apparatus according to a second modified embodiment.
FIG. 7 is a partial cross-sectional view schematically illustrating
a non-limiting example of the internal configuration of a
television receiving apparatus according to Embodiment 2.
FIG. 8 is a partial cross-sectional view schematically illustrating
a non-limiting example of the internal configuration of a
television receiving apparatus according to Embodiment 3.
FIG. 9 is an enlarged perspective view schematically illustrating a
non-limiting example of a hook and a locking piece.
FIG. 10 is a perspective view of a non-limiting example of an
optical sheet as seen from a rear side thereof.
FIG. 11 is an enlarged development view of a non-limiting example
of the optical sheet.
FIG. 12 is a partial cross-sectional view illustrating a
non-limiting example embodiment in which a part of the
configuration of the hook is changed.
FIG. 13 is a partial cross-sectional view illustrating a
non-limiting example embodiment in which a part of the
configuration of the hook is changed.
FIG. 14 is a development view of the optical sheet for
schematically illustrating a non-limiting example embodiment in
which a part of the configuration of the locking piece and the
positioning locking piece is changed.
FIG. 15 is a development view of the optical sheet for
schematically illustrating a non-limiting example embodiment in
which a part of the configuration of the locking piece and the
positioning locking piece is changed.
FIG. 16 is a partial cross-sectional view schematically
illustrating a non-limiting example of the internal configuration
of a display apparatus in which a part of the configuration of the
diffusion plate is changed.
FIG. 17 is a partial cross-sectional view schematically
illustrating a non-limiting example of the internal configuration
of a display apparatus in which the locking piece and the hook are
applied to a direct type light source unit.
DETAILED DESCRIPTION OF NON-LIMITING EXAMPLE
Embodiments
Embodiment 1
Hereinafter, a television receiving apparatus according to
Embodiment 1 will be described in detail with reference to the
accompanying drawings. FIG. 1 is a perspective view schematically
illustrating a non-limiting example of the television receiving
apparatus according to Embodiment 1.
FIG. 1 illustrates a television receiving apparatus 1. The
television receiving apparatus 1 includes a display apparatus 100
for displaying an image thereon, a tuner 200 (a receiving unit) for
receiving a broadcast wave from an antenna (not illustrated), and a
decoder 300 for decoding the encoded broadcast wave. In the
television receiving apparatus 1, the decoder 300 decodes the
broadcast wave received by the tuner 200, and the display apparatus
100 displays the image thereon based on decoded information.
The display apparatus 100 includes a rectangular liquid crystal
display panel 10, and a light source unit 40 to be described below.
The liquid crystal display panel 10 is configured so as to adjust
transmittance of light by controlling a voltage applied to a liquid
crystal. The display apparatus 100 is housed between a front
cabinet 20 and a rear cabinet 30 which are disposed in front and
back with a display surface (a surface on which a user is viewing
in a normal using mode) of the liquid crystal display panel 10 on a
front side (Hereinafter, the surface on which the user is viewing
in the normal using mode will be referred to as a front surface,
and a surface opposite to the front surface will be referred to as
a rear surface. In addition, the front surface side will be
referred to as a front side, and the rear surface side will be
referred to as a rear side). The front cabinet 20 is formed in a
rectangular frame shape, and has a rectangular opening 20a formed
at a center part thereof. The front cabinet 20 is made of, for
example, aluminum.
The rear cabinet 30 is formed in a rectangular tray shape of which
the front side is open, and is made of, for example, an electro
galvanized steel sheet. Further, the front cabinet 20 and the rear
cabinet 30 may be made of a resin member. The above-described tuner
200 and the decoder 300 are housed between the front cabinet 20 and
the rear cabinet 30. Alternately, the tuner 200 and the decoder 300
may be disposed outside of the display apparatus 100 and connected
to the display apparatus 100.
FIG. 2 is a partial cross-sectional view schematically illustrating
a non-limiting example of an internal configuration of the
television receiving apparatus 1.
The display apparatus 100 includes the liquid crystal display panel
10 and the light source unit 40 for irradiating light to the liquid
crystal display panel 10. The light source unit 40 includes a
rectangular deep-dish shaped backlight chassis 48, a rectangular
light guide plate 41 housed in the backlight chassis 48, and an LED
51 for irradiating light to the light guide plate 41.
The light guide plate 41 is supported on a bottom of the backlight
chassis 48. The rear surface of the light guide plate 41 is
provided with a reflection sheet 42 for reflecting light. The front
surface (one surface) of the light guide plate 41 is covered with a
diffusion sheet 43 for diffusing light.
An LED substrate 50 with a plurality of LEDs 51 mounted thereon is
attached to a side of the backlight chassis 48 through a heat
radiation plate 49. The LED 51 faces a peripheral surface of the
light guide plate 41. Further, the LED substrate 50 may be directly
attached to the side of the backlight chassis 48 without providing
the heat radiation plate 49.
The front surface of the light guide plate 41 is covered with the
diffusion sheet 43, and faces a rectangular diffusion plate 44 for
diffusing light. The front surface of the diffusion plate 44 is
covered with an optical sheet 45 for adjusting an emission
direction of the light. The liquid crystal display panel 10 faces
the front surface of the diffusion plate 44.
The liquid crystal display panel 10 and the diffusion plate 44 are
supported by a panel chassis 47. The panel chassis 47 is a white
rod-shaped body extending along an edge of the liquid crystal
display panel 10.
The panel chassis 47 has a support body 47a of an L-shaped cross
section to support the liquid crystal display panel 10 and the
diffusion plate 44. The support body 47a includes a panel support
portion 471 which faces a peripheral surface of the diffusion plate
44 and extends toward an edge portion of the liquid crystal display
panel 10, and a diffusion plate support portion 472 which protrudes
at a right angle from a rear side end of the panel support portion
471 to the diffusion plate 44 side, and faces the rear surface of
the diffusion plate 44.
The front side end of the panel support portion 471 supports a rear
edge part of the liquid crystal display panel 10. The diffusion
plate support portion 472 supports a rear edge part of the
diffusion plate 44. The liquid crystal display panel 10 and the
diffusion plate 44 face with each other with a predetermined
gap.
A protruding end of the diffusion plate support portion 472 is
provided with an attaching plate 47c (an elongated portion) which
protrudes to the rear side for attaching a bezel 46 which will be
described below to the backlight chassis 48. In addition, the
protruding end of diffusion plate support portion 472 is provided
with a reflection plate 47b (a protrusion portion) which protrudes
toward an inside of the diffusion plate 44 from the protruding end
in a direction opposite to the panel support portion 471, and
obliquely crossed with respect to the diffusion plate 44.
The attaching plate 47c is disposed on an outer surface of the
backlight chassis 48. A front edge portion of the liquid crystal
display panel 10, a peripheral surface of the liquid crystal
display panel 10, and outer surfaces of the support body 47a and
the attaching plate 47c are covered by the frame shaped bezel 46.
The bezel 46 has a recess 46a at a portion facing the attaching
plate 47c.
Through holes (not illustrated) are formed in the recess 46a and
the attaching plate 47c, and a screw hole (not illustrated)
corresponding to the through holes is formed in the backlight
chassis 48. When a screw 60 is inserted into the respective through
holes and screwed into the screw hole, the bezel 46, the panel
chassis 47 and the backlight chassis 48 are connected with each
other.
The heat radiation plate 49 and the LED substrate 50 are positioned
on the rear side of the reflection plate 47b, and are concealed by
the reflection plate 47b as seen from the front surface. In other
words, the reflection plate 47b covers the front side of the LED
51. A tip part of the reflection plate 47b faces the front edge
portion of the light guide plate 41, and the reflection plate 47b
is inclined toward the outside of the edge of the light guide plate
41.
Next, a relationship between an inclination angle .theta. (see FIG.
2) of the reflection plate 47b with respect to the front surface of
the light guide plate 41 and luminance in the front surface of the
liquid crystal display panel 10 will be described. FIG. 3 is a
graph illustrating a non-limiting example of a relationship between
a distance from a tip of the LED 51 in a direction toward an inside
of the light guide plate 41 and a relative value of luminance when
luminance at a position of 50 mm inward of the light guide plate 41
from the tip of the LED 51 is set to 1. Further, the distance from
the tip of the LED 51 to the tip of the reflection plate 47b is
sufficiently smaller than 50 mm, for example, 25 mm or less. FIG. 4
is a schematic diagram illustrating a non-limiting example of a
relationship between an inclination angle of the reflection plate
47b and dark and light bands which are viewed on the display
surface of the liquid crystal display panel 10. In FIG. 4, a
hatched portion represents the dark band, while a portion without
hatching represents the light band.
As illustrated in FIG. 3, when the inclination angle .theta. is 20
degrees, the relationship between the distance from the tip of the
LED 51 and the relative value of the luminance is in a
substantially proportional relationship, and as the distance from
the tip of the LED 51 is increased from 0 to 50 mm, the relative
value of the luminance is increased from substantially 0 to 1. When
the inclination angle .theta. is 30 degrees, an inclination in a
range between 0 to 10 mm of the distance from the tip of the LED 51
is larger than the case that the inclination angle .theta. is 20
degrees. In addition, at a position in which the distance from the
tip of the LED 51 is 10 mm, when the inclination angle .theta. is
20 degrees, the relative value of the luminance is substantially
0.25, but when the inclination angle .theta. is 30 degrees, the
relative value of the luminance is substantially 0.45. As
illustrated in FIG. 4, when the inclination angle .theta. is 30
degrees, an area occupied by the dark band in the distance range of
0 to 10 mm is smaller than the case that the inclination angle
.theta. is 20 degrees, and the distance is closer to 0 mm (is
closer to the edge side of the liquid crystal display panel 10),
thereby it is difficult for the dark band to be recognized by the
user.
The relative value of the luminance at a position in which the
distance from the tip of the LED 51 is 10 mm is, when the
inclination angle .theta. is 45 degrees, substantially 0.7, when
the inclination angle .theta. is 57 degrees, substantially 0.75,
and when the inclination angle .theta. is 80 or 90 degrees,
substantially 0.88. In either case, the relative value of the
luminance is greatly improved, and the area occupied by the dark
band in the distance range of 0 to 10 mm is smaller than the case
that the inclination angle .theta. is 30 degrees, and further the
distance is closer to a position of 0 mm, thereby it is more
difficult for the dark band to be recognized by the user.
Therefore, considering the luminance in the front surface of the
liquid crystal display panel 10, it is preferable that the
inclination angle .theta. of the reflection plate 47b is determined
in a range of 30 degrees or more but less than 90 degrees, more
preferably, 45 degrees or more but less than 90 degrees.
The liquid crystal display panel 10 has a larger area than the
diffusion plate 44. The diffusion plate 44 faces the center part of
the liquid crystal display panel 10, and the edge of the liquid
crystal display panel 10 is positioned outside from the diffusion
plate 44. The liquid crystal display panel 10 includes a display
region displaying an image and a non-display area not displaying
the image. The display region occupies the center part of the
liquid crystal display panel 10, while the non-display region is
positioned at a peripheral edge part of the liquid crystal display
panel 10. In FIG. 2, L1 represents a boundary between the display
region and the non-display region, and the inside from the L1 is
the display region (a left side in FIG. 2), while the outside (a
right side in FIG. 2) thereof is the non-display region.
A place in which the reflection plate 47b is continued to the
diffusion plate support portion 472 is positioned outside from the
display region of the liquid crystal display panel 10. L2 in FIG. 2
represents a position of the place in a direction parallel to the
liquid crystal display panel 10. Herein, L2 is positioned outside
from L1, and is positioned in the non-display region.
The light emitted from the LED 51 is incident on the light guide
plate 41, and the light is dispersedly emitted from the entire
front surface of the light guide plate 41 by repeatedly proceeding
a total reflection by the reflection sheet 42 on the rear surface
of the light guide plate and a partial reflection by the front
surface thereof. The emitted light is diffused by the diffusion
sheet 43, and is irradiated to the diffusion plate 44. When the
light diffused by the diffusion sheet 43 has reached the reflection
plate 47b, it is reflected by the reflection plate 47b so as to be
irradiated to the diffusion plate 44. The light irradiated onto the
diffusion plate 44 is diffused through the optical sheet 45 to
display an image on the liquid crystal display panel 10.
In the television receiving apparatus 1 according to Embodiment 1,
the LED substrate 50 and the heat radiation plate 49 are positioned
in the display region, but are concealed by the reflection plate
47b. Since the light emitted from the front surface of the light
guide plate 41 is reflected by the reflection plate 47b, shadows
caused by the reflection plate 47b may not appear on the liquid
crystal display panel 10, and decreasing of the luminance on a
portion facing the reflection plate 47b in the liquid crystal
display panel 10 may be prevented.
Since the reflection plate 47b is inclined, the light which has
reached the reflection plate 47b may be reflected efficiently to
the front surface. In addition, by setting the inclination angle
.theta. of the reflection plate 47b to be greater than 20 degrees
and smaller than 70 degrees, even if the reflection plate 47b is
positioned in the display region of the liquid crystal display
panel 10, the luminance of the liquid crystal display panel 10 may
be maintained.
In addition, since the diffusion sheet 43 is provided on the front
surface of the light guide plate 41, the light emitted from the
light guide plate 41 faces to the reflection plate 47b, and thereby
allowing more light to be reflected by the reflection plate 47b.
Further, since the diffusion plate 44 is provided between the
liquid crystal display panel 10 and the light guide plate 41, it is
possible to ensure uniform light incident on the liquid crystal
display panel 10, and prevent an appearance of shadows caused by
the reflection plate 47b.
In addition, since the panel support portion 471 supports the
liquid crystal display panel 10 and the diffusion plate 44 outside
of the display region, shadows caused by the panel support portion
471 does not appear on the liquid crystal display panel 10.
Further, since the LED 51 is positioned in the display region, but
is concealed by the reflection plate 47b, it is possible to achieve
the thinning of the display apparatus, and prevent the LED 51 from
being viewed. Furthermore, it is possible to easily achieve the
narrowing of the edge light type light source unit 40, as compared
to the direct type light source unit.
A part of the configuration of the television receiving apparatus 1
according to Embodiment 1 may be changed as illustrated and
described below. FIG. 5 is a partial cross-sectional view
schematically illustrating a non-limiting example of the internal
configuration of a display apparatus according to a first modified
embodiment. As illustrated in FIG. 5, a reflection plate 47b having
a curved reflection surface may be used. In this case, the
curvature of the curved surface may be appropriately set in
consideration of reflection efficiency. As long as the light is
reflected, the reflection surface may be either a convex surface or
a concave surface.
FIG. 6 is a partial cross-sectional view schematically illustrating
a non-limiting example of the internal configuration of a display
apparatus according to a second modified embodiment. As illustrated
in FIG. 6, a reflection plate 47b having a stepped reflection
surface may be used. In this case, the number of the steps, the
height of the steps, and the width of the steps may be
appropriately set in consideration of the reflection
efficiency.
Further, when two facing edge portions of the liquid crystal
display panel 10 are support by the panel chassis 47 and 47, in
order to ensure uniformity of the luminance, it is preferable that
both panel chassis 47 and 47 may have a symmetric shape. The color
of the panel chassis 47 may be any color capable of reflecting
light, without being particularly limited to white, and it may be
silver, for example.
Embodiment 2
Hereinafter, a television receiving apparatus 1 according to
Embodiment 2 will be described in detail with reference to the
accompanying drawings. FIG. 7 is a partial cross-sectional view
schematically illustrating a non-limiting example of the internal
configuration of the television receiving apparatus according to
Embodiment 2.
The television receiving apparatus 1 includes a support body 70 (a
support part) which is disposed between the diffusion plate 44 and
the light guide plate 41 so as to support the diffusion plate 44.
The support body 70 includes a base plate 71 parallel to the
diffusion plate 44, and a support pin 72 which is integrally molded
with the base plate 71. The support pin 72 is formed in a cone
shape, and protrudes in a direction crossing both surfaces of the
base plate 71. The support pin 72 and the base plate 71 are
translucent.
The support body 70 is disposed between the diffusion plate 44 and
the light guide plate 41 in such a manner that a sharp end side of
the support pin 72 faces the diffusion plate 44 and the other side
thereof is placed on the light guide plate 41. A gap is formed
between the sharp end of the support pin 72 and the diffusion plate
44. For example, a gap of 0.5 mm or more is formed therebetween.
Further, an edge portion of the base plate 71 is locked to an
inclined plate 47b.
Even when the diffusion plate 44 is bent due to its own weight, the
diffusion plate 44 is supported by the support pin 72, and thereby
decreasing of display quality due to the bending of the diffusion
plate 44 may be prevented. In addition, since the base plate 71 and
the support pin 72 are translucent, an appearance of shadows onto
the liquid crystal display panel 10 may be prevented.
Further, the base plate 71 and the support pin 72 are not limited
to the integral molding. For example, a through hole may be formed
in the base plate 71, and the support pin 72 may be inserted into
the through hole to be held therein.
The same parts of the configuration according to Embodiment 2 as
those in Embodiment 1 will be denoted by the same reference
numerals, and will not be described.
Embodiment 3
Hereinafter, a television receiving apparatus 1 according to
Embodiment 3 will be described in detail with reference to the
accompanying drawings. FIG. 8 is a partial cross-sectional view
schematically illustrating a non-limiting example of the internal
configuration of the television receiving apparatus 1, FIG. 9 is an
enlarged perspective view schematically illustrating a non-limiting
example of a hook 471a and a locking piece, FIG. 10 is a
perspective view of a non-limiting example of an optical sheet 45
as seen from a rear side thereof, and FIG. 11 is an enlarged
development view of a non-limiting example of the optical sheet 45.
In FIG. 11, dimensions of each part of the optical sheet 45 are
illustrated by A to C, A', B', and P.
As illustrated in FIGS. 8 and 9, an L-shaped hook 471a (a
protrusion part) protrudes outward from an outer surface of a panel
support portion 471. The hook 471a includes a portion protruding
outward from the outer surface of the panel support portion 471,
and a portion which protrudes rearward from the protrusion end of
the portion, and has an outer surface which is inclined so as to be
narrowed toward the rear side. In the front side portion from the
hook 471a of the panel support portion 471, a plurality of
insertion holes 471b, into which positioning locking pieces 450 or
locking pieces 451 to be described below are inserted, are arranged
to the panel support portion 471 in order.
A vertical width and horizontal width of the optical sheet 45 is
equal to or greater than those of the diffusion plate 44. As
illustrated in FIGS. 10 and 11, the positioning locking pieces 451
are provided at center parts of an edge portion of the optical
sheet 45, and the same number of the locking pieces 450 are
distributedly disposed on both sides of the positioning locking
piece 451. The positioning locking pieces 451 and the locking
pieces 450 extend from an edge of the optical sheet 45. The locking
piece 450 is formed in an elongated rectangular shape in a
direction along the edge of the optical sheet 45. The locking piece
450 may be provided on one side or a plurality of sides of the
optical sheet 45.
The positioning locking pieces 451 and the locking pieces 450 are
provided with through holes 450a and 451a which are formed at
center parts thereof in an elongated rectangular shape in a
direction along the edge of the optical sheet 45. Four corners of
the through holes 450a and 451a are chamfered and curved. Pitches P
between the positioning locking pieces 451 and the locking pieces
450 are set to 150 mm or more. Perforations 453 are formed on the
positioning locking pieces 451 and the locking pieces 450. The
perforations 453 are positioned at a boundary between the
positioning locking pieces 451 and locking pieces 450 and the edge
of the optical sheet 45, or at the positioning locking pieces 451
or the locking pieces 450 next to the boundary.
A longitudinal dimension A of the through hole 451a of the
positioning locking piece 451 is 0.3 mm longer than that of the
hook 471a in the direction along the edge of the optical sheet 45.
A longitudinal dimension B of the positioning locking piece 451 is
at least 6 mm longer than the longitudinal dimension A of the
through hole 451a. A dimension C between an outer edge of the
positioning locking piece 451 and an edge of the through hole 451a
is 1.5 mm or more.
A longitudinal dimension A' of the through hole 450a of the locking
piece 450 is longer than the longitudinal dimension A of the
through hole 451a of the positioning locking piece 451. A
longitudinal dimension B' of the locking piece 450 is equal to or
longer than the longitudinal dimension B of the positioning locking
piece 451. Further, a dimension between an outer edge of the
locking piece 450 and an edge of the through hole 450a is equal to
the dimension C.
As illustrated in FIG. 8, the locking piece 450 and the positioning
locking piece 451 are inserted into the insertion holes 471b, so
that the perforations 453 are positioned outside from the panel
support portion 471. In addition, as illustrated in FIGS. 8 to 10,
the locking piece 450 and the positioning locking piece 451 are
folded to the rear side with the perforation 453 as a folding line,
so that the hook 471a is inserted into the through holes 450a and
451a. The hook 471a is locked to the edge portion of the through
holes 450a and 451a. The optical sheet 45 is supported by the
locking of the locking piece 450 and the positioning locking piece
451 with the hook. The bezel 46 has a through hole 46b at a portion
corresponding to the hook 471a, and the hook 471a is inserted into
the through hole 46b. Further, it is preferable that a front-back
dimension of the hook 471a is 5 mm or more for locking the optical
sheet 45. In addition, by inserting the hook 471a into the through
hole 451a of the positioning locking piece 451, the optical sheet
45 is positioned.
As described above, the longitudinal dimension A of the through
hole 451a is 0.3 mm longer than that of the hook 471a, and the
longitudinal dimension A' of the through hole 450a is longer than
the longitudinal dimension A. Therefore, as illustrated in FIG. 9,
a clearance may be formed between the edges of the through holes
450a and 451a and the hook 471a. In addition, since the
longitudinal dimension A' of the through hole 450a of the locking
piece 450 is longer than the longitudinal dimension A of the
through hole 451a of the positioning locking piece 451, even if the
optical sheet 45 is thermally expanded or contracted, wrinkles are
not generated on the optical sheet 45
As illustrated in FIG. 9, by abutting outer edge portions of the
through holes 450a and 451a with the hook 471a, the optical sheet
45 is supported by the hook 471a. A load of the optical sheet 45 is
dispersed by the plurality of hooks 471a, 471a, . . . , and
471a.
The locking piece 450 and the positioning locking piece 451 are
folded to the back side of the diffusion plate 44, and the hook
471a is inserted into the through holes 450a and 451a, thereby the
optical sheet 45 is locked with respect to the panel chassis.
Therefore, the optical sheet 45 may cover the entire front surface
of the diffusion plate 44. When the television receiving apparatus
1 is vertically disposed so that the hook 471a and the locking
piece 450 are positioned on the upper side, the optical sheet 45
may be hung on the front surface of the diffusion plate 44 due to
the weight of the optical sheet 45.
Since the edge of the optical sheet 45 can be positioned equal to
the edge of the diffusion plate 44 or outside therefrom, the
optical sheet 45 may cover the entire diffusion plate 44 to prevent
light leakage. In addition, since the edge portion of the optical
sheet 45 covers the edge of the diffusion plate 44 and is hidden by
the bezel 46, when a user is viewing the television receiving
apparatus 1 from an oblique direction with respect to the liquid
crystal display panel 10, the edge of the optical sheet 45 is not
visible, and thereby display quality may be improved.
A part of the configuration of the television receiving apparatus 1
according to Embodiment 3 may be changed as illustrated and
described below. FIGS. 12 and 13 are partial cross-sectional views
illustrating embodiments in which a part of the configuration of
the hook 471a is changed mode, respectively.
As illustrated in FIG. 12, the hook 471a may be formed in a T
shape. In this case, the hook 471a is provided with a shaft portion
which protrudes outward from a side of the panel support portion
471 and has a slotted hole which is formed in a protrusion end part
thereof and is open outward, and portions which protrude to the
front side and the rear side from the two end parts of the shaft
portion, respectively. Due to the slotted hole, the hook 471a may
have high flexibility, and the hook 471a may be inserted into the
through holes 450a and 451a even if the sharp end of the hook 471a
has a larger diameter than that of the through holes 450a and
451a.
In addition, as illustrated in FIG. 13, the hook 471a may be formed
in an I shape. In this case, the hook 471a is provided with only a
portion protruding outward from the side of the panel chassis
47.
FIGS. 14 and 15 are development views of the optical sheet 45
schematically illustrating embodiments in which a part of the
configuration of the locking piece 450 and the positioning locking
piece 451 is changed, respectively. As illustrated in FIG. 14, the
locking piece 450 and the positioning locking piece 451 may be
formed in a hook shape. In this case, the hook 471a is inserted
into a hook-shaped center portion. In addition, a second through
hole 450b may be formed on an outside of a rectangular through hole
450a. For example, as illustrated in FIG. 15, a circular hole, and
the second through hole 450b communicating with the circular hole
through the through hole 450a may be formed in the optical sheet.
In this case, due to the second through hole 450b, the outer edge
portion of the through hole 450a may be easily bent, and the hook
471a may be easily inserted into the through hole 450a.
FIG. 16 is a partial cross-sectional view schematically
illustrating a non-limiting example of the internal configuration
of a display apparatus in which a part of the configuration of the
diffusion plate 44 is changed. As illustrated in FIG. 16, a hook
441a protrudes outward from the peripheral surface of the diffusion
plate 44. In this case, the locking piece 450 and the positioning
locking piece 451 are positioned between the peripheral surface of
the diffusion plate 44 and a P chassis, while the hook 441a is
inserted into the through holes 450a and 451a of the locking piece
450 and the positioning locking piece 451.
Further, the locking piece 450, the positioning locking piece 451
and the hooks 471a and 441a may be applied not only to the edge
light type light source unit 40, but also to a direct type light
source unit 40, as illustrated in FIG. 17. In this case, the light
source, for example, the LED substrate 50 mounted with LED 51 is
fixed to the bottom of the backlight chassis 48.
When the optical sheet 45 is formed of a plurality of sheets, the
locking piece 450 is provided on the optical sheet 45 closest to
the liquid crystal display panel 10, while the other optical sheet
45 may not be provided with the locking piece 450 or may be
provided with the locking piece 450 fewer than the optical sheet 45
closest to the liquid crystal display panel 10. The reason is that,
if the optical sheet 45 closest to the liquid crystal display panel
10 is locked, it is possible to prevent the other optical sheet 45
from releasing to the outside. Of course, all the optical sheets 45
may be provided with the same number of locking pieces 450 as each
other. In addition, the positioning locking piece 451 and the
locking piece 450 may be provided with an even number per side of
the optical sheet 45, and only a single number of the positioning
locking piece 451 may be provide on one side of the optical sheet
45. Further, it is not necessary for the positioning locking piece
451 to be provided on the center part of the edge portion of the
optical sheet 45, and the optical sheet 45 may be provided at a
position separated from the center part.
The above-described light source unit 40 of the television
receiving apparatus 1 may be used for other applications. For
example, instead of the liquid crystal display panel 10, a
transparent or translucent acrylic plate may be provided on the
front surface of the light source unit 40 so as to be used as a
lighting device for illuminating a living room by transmitted
light. In addition, characters and graphics, or the like may be
depicted on the acrylic plate so as to be used as an advertising
device. The light source is not limited to the LED 51, but other
light sources such as a cold-cathode fluorescent tube,
electroluminescence device, laser diode (LD), or the like may be
used.
As this description may be embodied in several forms without
departing from the spirit of essential characteristics thereof, the
present embodiment is therefore illustrative and not restrictive,
since the scope is defined by the appended claims rather than by
the description preceding them, and all changes that fall within
metes and bounds of the claims, or equivalence of such metes and
bounds thereof are therefore intended to be embraced by the
claims.
DESCRIPTION OF REFERENCE NUMERALS
1 television receiving apparatus
10 liquid crystal display panel
41 light guide plate
51 LED (light source)
47 panel chassis (reflection part)
47b reflection plate (protrusion portion)
47c attaching plate (elongated portion)
471a hook (protrusion part)
40 light source unit
43 diffusion sheet
44 diffusion plate
441a hook (protrusion part)
45 optical sheet
450 locking piece
451 positioning locking piece
70 support body (support part)
100 display apparatus
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